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Abiotic Factors (GCSE Biology)

The following is a GCSE Biology test covering 'Abiotic Factors' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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Which abiotic factor describes the amount of water held in soil that plants can use?
Which abiotic factor would you record to study microclimate differences between shaded and exposed sites in a forest?
Which abiotic factor is most important in determining the oxygen concentration for organisms living in soil?
When investigating effects of temperature on an ectotherm’s activity, which abiotic factor must be controlled to make the experiment valid?
In aquatic ecosystems, which abiotic factor most directly limits the distribution of many fish species?
Which abiotic factor is the main cause of increased evaporation and faster transpiration from leaves?
Which abiotic factor would most likely be the limiting factor for a plant growth experiment performed inside a sealed jar?
Which abiotic factor would most affect the carrying capacity for large grazing mammals on a grassland?
In an experiment on aquatic plants, which abiotic factor would you change to investigate its effect on gas bubble production as a measure of photosynthesis?
A student measures dissolved oxygen in a stream to assess water quality. Which abiotic factor will most reduce dissolved oxygen?
Salt concentration in soil is an abiotic factor. How will very high soil salinity most directly affect plant cells?